mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: Opaque white to translucent, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Opaque white to translucent, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed via hydrothermal activity where silica-rich fluids cool in veins or as massive deposits. This specific specimen is a water-worn river pebble, rounded by mechanical weathering over long periods.
Uses & applications
Used in landscaping, construction aggregate, glass making, and as decorative stones for collectors or aquarium use.
Geological facts
The milky appearance is caused by tiny inclusions of gas and liquid trapped during the crystal's formation. It is one of the most common mineral varieties on Earth's crust.
Field identification & locations
Identify in the field by its white color, ability to scratch glass (hardness 7), and water-worn smooth texture. Found globally in riverbeds, beaches, and mountain trails.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous